If your a KISS type of grower then it works great, just be prepared to make slight adjustments to the "recipe" but it is pretty on it. And as I understand it that they will test your water for you and make a formula just for you if you buy a large enough amount. I believe it is something like 5 pounds or so and I know that if you call the number on the website you can speak directly to the guy that owns the company. Also you can order a sample if you call or email them and he will send it priority straight to you(labeled hydroponic-research if it matters to you). Personally IMO it is a bit expensive for something that is supposed to simple otherwise I would be using it now. If you use it I doubt you will be disappointed though.
KnB